Electrochemical Study on Corrosion Inhibition of Copper in Hydrochloric Acid Medium and the Rotating Ring-Disc Voltammetry for Studying the Dissolution

Table 2

Results of capacitance and resistance values from impedance measurements at 298 K.

Solution	𝑅𝑠/Ohm cm^2	* 𝐶1/𝜇F cm^−2	Roxide/Ohm cm^2	* 𝐶2/𝜇F cm^−2	𝑛	𝑅ct/Ohm cm^2
0.5 M HCl	102	1.5	500	10.3	0.85	300
0.5 M HCl + 10 mM ATA	150	0.56	1021	3.5	0.92	2000

* 𝐶₁ is obtained from the pure capacitance and 𝐶₂ from CPE of the equivalent circuit as shown in the inset of Figure 2.